How about the 5R rifling? I see it was mentioned in this article (and a few others) but I don't know anyone else who have real world experience with it. I guess Remington even makes a factory 5R 700, but there again I don't know anyone who owns one.

Ron (of Benchmark) ordered the button for the faster twist .277" with "5R style" rifling. He believes it may be easier on the bullet jackets. I have had many different barrels with many different styles of rifling (land/groove configurations etc.). In general you won't notice much difference as a shooter.... I recently tested an experimental two-groove barrel for a 308 win... shoots as good as any 5r I've owned.